Robert adams



(No Model.) 3 SheetsSheet 1..

R. ADAM-S. I PNEUMATIC DOOR CHECK.

No. 397,326. Patented Feb. 5 1889.

F IG I (No Model.) 3 Sheets-Sheet 2 R. ADAMS.

- PNEUMATIC DOOR. CHECK.

No. 397,326; Patented Feb. 5. 1889.;

(No Model.) 3 SheetsSheet 3.

R. ADAMS.

PNEUMATIC DOOR GHEGK. No. 397,326. Patented Feb. 5, 1889.

Wm E Vim/w JJEOZeTZ%/W ROBERT ADAMS, OF SOUTHl VARK, COUNTY OF SURREY, ENGLAND.

PNEUMATIC DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 397,326, dated February 5, 1889. Application filed July 28, 1888. Serial No. 280,725. (No model.) Patented in England Febrnary 21, 1887, No. 2,685.

To all whom it may concern.-

Be it known that I, ROBERT ADAMS, a subject of the Queen of Great Britain, residing at 17 Blackman Street, Southwark, in the county of Surrey, England, engineer, have invented certain new and useful Improvements in Door-Closing Appliances and Checks for the Same, (for which I have obtained a patent in Great Britain, No. 2,685, bearing date February 21, 1887,) of which the following is a specification.

The object of my invention is to provide an improved apparatus for closing doors and checking such closing to prevent slamming, such closing and checking apparatus being capable of adjustment and application to their respective purposes either separately or together or in combination with other door springs and checks.

And in order that my said invention may be particularly described and ascertained, reference is hereby made to the accompanying drawings, in which similar letters of reference indicate corresponding parts.

Figure 1 is an elevation, and Figs. 2 and 3 horizontal sections, showing one method of applying my invention to the inside of the door. Figs. 4, 5, and 6 illustrate the manner of applying the invention to the outside of a door. Figs. 7 and 8 show the links a and f of Figs. 1, 2, and 3 elongated and their attaching-plates placed farther apart.

In Figs. 1 and 2 the door a is shown closed and in Fig. 3 it is shown open. The door a is hinged at l).

c is the lintel or transom, to which the barrel (l is fixed by the bracket .2, as shown.

6 is any arm fixed to the door by the plate e. The link c is pivoted to the arm c.

f is a plate screwed to the transom, having a double link, f, pivoted thereto.

g is a vibrating piston-rod, forming a con necting-rod between the piston inside the cylinder or barrel (Z and the pivot 71 The ends of the links e and f and the end of the piston-rod g are united at 7t by a screw or rivet, upon which they respectively pivot. \Vhen the door is in a closed position, as shown in Figs. 1 and 2, the leverage of the combina tion is at or near its most advantageous position, and as the door is opened the leverage decreases, as shown in Fig. 3, where the joint 71. is shown much nearer to the transom than in Fig. 2.

Fig. 4 is an elevation, and Figs. 5 and 6 horizontal sections, showing a method of applying my invention to the outside of the door. In this arrangement thebarrel d is screwed to the door by the bracket .2, and the plate f and double link f are also fixed to the door. 2 is a plate fixed to the transom, to which the arm 7; is pivoted. The form of this arm 10 is clearly shown in Fig. 4 and its direction with respect to the links f in Figs. 5 and 6. The junction of the piston-rod gwith the arm 7%) is a short distance from the end of the link f. The leverage in this arrangement also decreases as the door opens, asshown in Fig. 6.

Fig. 7 is a horizontal section showing an arrangement in which the lower link, f, and the link 6 are elongated and the plates f and e are placed farther apart. IVi-th this exception, the arrangemci'lt .is similar to that shown in Figs. 1, 2, and 3.

Fig. 8 is an elevation of the plate and links f,f and cishowingthe method of construction.

Instead of placing the usual spring in the barrel, I sometimes place a coiled spring in or near the position shown by the dot-ted circle I, Fig. 7, such spring acting upon the links f or upon the pivot or axle, to which it is fixed by suitable connections.

0 is the inlet-valve for the air, and p is the outlet-valve, which is regulated by a screw, as

usual in the construction of air-clmeks.

The relative sizes, forms, and. methods of constructing the joints and brackets may be varied to suit the different positions and fittings ot the door. In some cases I find it advantageous to iit an additionallink, as shown by a dotted line at r in Fig. 2, the end of which works in a slotted bracket, .9. (Shown also in dotted lines.)

The bracketsf and and their mode of connections with the cylinder and frame maybe otherwise constructed, so as to be more suitable for fixing to very narrow transolns and rails.

Having now particularly described and aseertained the nature of my saidinvention and other to the door-frame, substantially as de- 10 in Whatmanner the same is to he performed, scribed. I declare that what I claim is In a door closingand checking device, the combinaiion, with the cylinder, the vibratory \Vitneseee:

ROBERT ADAMS.

pist0n-r0d, and a single-arn'led link, of the GEORGE (l. l)QWl\fIN(;, pivoted double-armed link ff', connected to S Qualify Court, London, W. U. the iflstonqrorl and single-armed link, one of PERCY K. \VOODWARII),

said links being attached to the door and the 25 Soufhmnpfon lfufldings, Lem Ion, Wl U. 

